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Na. 652,174. PATENTED PBB.16, 1904.

' J. A. MINTURN.

BURGLAR ALARM.

- APPLIUATION FILED NOV. 12, 1903.

N0 MODEL. 2 SHEETS-SHEET 1.

PATENTBD FEB. 16, 1904.

v V J. A! MINTUEN BURGLAR ALARM.

PLIUATIOQN FILED 110112. 1903.

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UNITED STATES Patented February 16, 1904.

PATENT OFFICE.

JOSEPH A. MINTURN, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE- I-IALF TO FRANK W. NOBLE, OF INDIANAPOLIS, INDIANA.

Bu'ReLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 752,174 dated February 16, 1904. Application filed November 12, 1903. Serial No. 180,87. (No model.)

To (all whmn it may concern:

Be it known that I, JOSEPH A. MINTURN, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Burglar-Alarms, of,

which the following is a specification.

This invention relates to improvements in detonating burglar-alarms; and the object is to provide a simple, inexpensive, and durable device which is applicable for use on both doors and windows. a

The object also is to provide a device that is easily and quickly set for an explosion or unset or made inoperative and that will be free and clear from interference with or by the door or window when the hammer portion is in the position of discharge.

The invention also embodies other details of construction, which will be hereinafter fully set forth and claimed.

Referring to the accompanying drawings, in which like characters of reference indicate like parts, Figure 1 is a perspective view of to a door; Fig. 2, an edge View looking in the direction of the arrow 2 of Fig. 1; Fig. 3, a front View of the blank from which the body of my device is formed; Fig. 4, a detail in back side View of the body of the device, showing manner of securing the wire spring; Fig. 5, a section on the line 5 5 of Fig. 1. Fig. 6 shows the invention as applied to a window. Figs. 1, 2, 6 show the alarm set ready for an explosive effort.

8 represents the body of the device, which is preferably stamped out of sheet metal, such as steel, iron, or brass; but it may be formed from cast metal, if so desired. One end of this body will be provided with holes for the passage of screws 9 9,by means of which the device will be secured to the door-casing in the manner shown. The opposite end of the body will have the oblique tongue 10, which is rolled back upon itself in the manner shown in Figs. 1, 2, and 6 to form the cartridge-shell holder 11. The length of the tongue will depend upon the size of the cartridge used. In practice the tongue will be made long enough to make the largest size holder and the end out 01f where not needed for the smaller size, thereby saving the expense of more than one die. The turned-back end will be secured by the rivet 12.

13 represents a blank cartridge of commerce. The upper major portion of the body is bent outwardly, as clearly shown in Fig. 2, to keep the woodwork which supports the body from being powder burned and smoked and also to make room for the swell in the body incident to the attachment of the springhainmer.

14 is a coiled spring preferably formed from round-steel spring-wire. One of its ends is extended to form the attaching arm 15, by means of which the wire is fastened to the body 8, and the other end is extended to form the arm 16, which acts as a hammer to explode the cartridge by percussion therewith through the energy of the spring. To this end it is necessary that the arm 15 be rigidly and securely fastened to the body 8, and this is accomplished effectually and economically by double slotting the body, as shown at 17 17, and corrugating the plate transversely of the slots, the outer corrugations being toward the front of the body and the middle corrugation being in a reverse direction or toward the back of the body. The arm 15 is introduced into the corrugations and withdrawal prevented by crimping the wire at 18 against the middle corrugation and pressing the walls of all of the corrugations closely against the arm.

The side of the body 8 above the attachment of the arm l5 has the ear 19, which is bent forward at right angles, as shown, to form a catch and holder for the arm 16 when the latter is depressed or set in position ready for an explosive effort. Being in this set position with a cartridge in the holder and the door 20 closed the arm 16 will be moved forward out of engagement with the ear 19 by the contact of the door with said arm on the opening of the door, whereupon the action of the spring will-force the arm with a strong quick movement against the cartridge into the position shown by the dotted lines in Fig. 1, exploding the cartridge with a loud report that will alarm the household and frighten away the burglar. When the arm 15 is in its position of contact with the cartridge, it is completely out of the path of the door and will be allowed to re main in that position during the day-time or such hours of the twenty-four as the alarm is not needed. To allow the cartridge to be inserted in the holder and removed, I cut away the body under the holder in the manner shown at 22. The pressure of the door against the arm 16 to dislodge it from its holding-ear 19 has a tendency to rotate the arm 15 in its seat, thereby loosening the fastening in time, and to counteract this hurtful tendencyIprefer to slot the body 8 at the middle of the backwardly-extended corrugation, as shown at 23, and press the crimp 18 into this slot. The sides of the slot form bearings for the crimped wire and hold it against rotation.

In applying the device to a window the body 8 is secured to the top rail of the lower sash, as shown in Fig. 6, and an oblique contactbar 24 is attached to the inner side of the window-casing in the path of the arm 16 when the window is raised. The oblique bar 24 throws the arm 16 off of the ear 19 the same as the door would do. The barwill preferably be of wire bent in the form of an elongated staple, the ends of which are driven into the woodwork of the casing; but a plate with an oblique contact edge might be used instead without departing from the spirit of this invention.

This device is turned the other side up when it is used on the left side of a window or with a door opening in opposite direction from that illustrated.

Having thus fully described my invention, what I claim as new, and wish to secure by Letters Patent ofthe United States, is

1. A burglar alarm, consisting of a body adapted for attachment to a support and formed from sheet metal, an integral arm extending from the body, having its end turned back to form a holder to receive a cartridge shell, said body having a side ear which is bent to the front to forma catch, and having a pair of parallel slits, the metal of said sheet between the slits and adjacent side edges of the sheet being corrugated toward the front of the sheet, and the metal between the slits being rearwardly corrugated, and a spring-lever secured at one end to the body by insertion into said corrugations and secured, the opposite end of said spring extending loosely in front of the holder-section of said arm to form a hammer which is caught before each detonation under said catch.

2. A burglar alarm, consisting of a body adapted for attachment to a support and formed from sheet metal, an integral arm extending from the body, having its end turned back to form a holder to receive a cartridgeshell, said body having a side ear which is bent to the front to form a catch, and having a pair of parallel slits, the metal of said sheet between the slits and adjacent side edges of the sheet being corrugated toward the front of the sheet,- and the metal between the slits being rearwardly corrugated, and a spring-lever secured at one end to the body by insertion into said corrugations after which the metal is pressed to the spring and the spring crimped, the opposite end of said spring extending loosely in front of the holder-section of said arm to form a hammer which is caught before each-detonation under said catch.

3. A burglar alarm, consisting of a body adapted for attachment to a support and formed from sheet metal, an integral arm extension from said body having its end turned back to form a holder to receive a cartridgeshell, said body having a side car which isbent outwardly to form a catch, said body alsohaving a pair of parallel slits the metal of said corrugation, the opposite end of said spring JOSEPH A. MINTURN.

Witnesses:

S. MAHLON UNGER, MURAT W. HOPKINS.

IOO 

